I think you are referring to the trimming sticks, used to get optimal sharpness (depending on the distance from glass. And here is a lot of information http://www.photo-i.co.uk/Reviews/interactive/ ...

Had no problem at all when I got my 750 and started scanning. And the Epson software is easy and very good. Maybe this is interesting for you: http://www.photo-i.co.uk/2013/05/printing-masterclass- ...